Back part forming machine



Nov 13, 1945.

E. R. DAVIS BACKPART FORMING MACHINE 2 Sheets-heet l Filed Sept. 25,1943 Wm 4 a Inventor: Emery R Dcwls.

Nov. 13, 1945. E. R; DAVIS 2,388,726

BACKPART FORMING MACHINE Filed Sept. 25, 1945 2 Sheets-Shet 2 r 2 8 p 2M Inventor.

Emel g R Davis A Patented Nov. 13, 1945 :Emerylt. Dauis, Beverly,Mass.,.assi gnor to United shoclMachinery CorporatiomFlemington, N. ".L,a corporation of .New Jersey Application September 25, 19/13, Serial :N0. 503,557

9 Claims.

This invention relates :to machines for use in the :iormation ofibackparts of shoe uppers and :more particularly i130 machines for rusein carrying :out the method and donning the article of manufacture aofapplication for Letters Patent of the United States, Serial "No.4595926, filed September -28, 1'942in the :name ofMerwinF. Ashley.

In accordance with the method :covered by the .above application, =.abackpart is formed by turning the marginal :portion of a hat backpartblank to form a heebattaching flange and an edge crease. The flange thusformed is corrugated without substantially stretching the material ofwhich the flange formed. By thus corrugating the-margin after the flangeis-formed the cor- 'rugations .are readily confined :to the flange asthe backpart is molded to final shape and objectionable wrinkles visiblein the finished shoe are avoided, as discussed in-detail theaforementioned application.

The formation of the corrugations in the flange is effected insuchmanner as :to preform the blank i-n'to somewhat the shape of a finishedbackpar-t. This is accomplished by formingeach of the corrugations ofvarying depths, the deepestpor tions of the "corrugations being alongthe edge of the flange, thereby to foreshorten it. causes the blank toassume -a curved shape and by forming thecorrugations in'only theheelend portion of the blank, the curvature is confined to this portionand the sides remain straight, so that the shape of theblank'approximates that of a finished backpart, and a minimum of finalmolding of the blank is required to form it to finished shape.

An object of the present invention is to provide improved mechanism foroperating on flat backpart blanks to carry out the method of theaforementioned application. To this end, .and'in accordance with afeature of the invention, the machine includes a pair of cooperatingrolls arranged to act progressively, upon opposite sides of the blank-toflange the lower marginal portion and form a well defined edge crease. Asecond pair of rollsacts progressively pon the flange of the blank afterthe flange has been formed by the first pair of rolls to impresscorrugations therein. The rolls of the second pair are provided withintermeshing teeth and the rolls :are mounted with their axes at a g esto each other so that the depths of the corrugations formed in the-flange decrease inwardly from the edge thereof. Provision is made forseparating the second pair of rolls at will to such an extent that-theybecome "ineffective to corrugate theflange so that the corrugations inthe :flange may ibe limited to the '-heelend portion of the blank.

The above and other features :of the invention will :now :be described'-with reference to the accompanying drawingsand pointed out in theclaims. 1

Inthedrawings,

Fig. 1 is a front elevation 'of one form of mechanism in which theinvention is embodied;

Fig. 2 is an end elevation partly in "section of the head of themachine, thisview being taken from the left of Fig. 1 and illustratingthe conru gating rolls;

Fig. 3 is a front elevation of the head of the machine illustrating "theaction of the :corrugating rolls on the work;

Fig. 4 is a vertical section through :the machine looking toward theleft illustrating the flange-formin rolls acting on a work piece;

Fig. '5 is'a perspective viewof the flange-forming rolls illustratingtheir action in turning the flang'e on the marginal portion of a "flat'backpart blank; and

Fig. 6 is a perspective viewer a blank af-terit has been acted upon bythe machine illustrated herein.

In the illustrated embodiment of the invention, the machine comprises ahousing Ill having a head II in which aresupported a pair offlange-forming rolls 12, -14 and a pair of corrugating rolls '16 and1-8. Theflange-"forming-roll M has a V-shaped periphery with whichcooperates the roll 12 having a complemental periphery, the rolls actingon a backpart blank B introduced therebetween to bend the lower marginalportion to form a flange F and an edge crease C. The sides of the V of-roll M are at right angles to each other, .as shown clearly in Fig. 4so that the flange F formed by the rolls lies at an angle ofsubstantially with respect to the rest of thebackpartblank.

The rolls l2 and M are mounted on shafts 2-0 and 22 respectivelyjournaled in the head ll of the housing l0, these shafts being parallelto each other and extendin downwardly and rearwardly at an angle ofapproximately 45 to the horizontal so that the ilange F formed by thecorrugating rolls 'will lie in a horizontal position to be subsequentlyacted upon by the cor-rugating "rolls, as will be described. The shaft20, carrying the flange for-ming roll 12, carries at its inner en-(1abevel gear 24 meshing with a bevel gear '26 on a vertical shaft 28journaled in bearings 30 and 32 in the housing N]. "The lower end of theshaft 28 is connected by bevel earing 34 to a counter-shaft 36 extendingoutwardly of the housing and carrying a pulley 38 connected by a belt 48to a suitable driving means. The flangeforming roll I2 is rotatedcontinuously during the operation of the machine, whereas the shaft 22carrying the roll [4 is not connected to the driving means and the rollturns freely although it will be understood that the shaft 22 may bedriven with the shaft 28 if desired by any suitable means. In turningthe marginal portion of the backpart blank to form the flange F and theedge crease C, the blank is introduced between the rolls I 2 and I4 withthe lower edge of the blank against a surface 42 which acts as a gage todetermine the width of the flange to be formed.

The rolls l2 and M are so spaced that they grip the opposite sides ofthe blank firmly and the blank is fed therebetween during the formationof the flange, as illustrated in Figs. 4 and 5.

The corrugations in the flange of the blank are formed withoutsubstantially stretching the material of the blank by the action of thecorrugating rolls l8 and I8 in progressively forming the corrugations.The corrugations are thus formed by foreshortening the flange ascontrasted from forming them simultaneously between a pair of molds, inwhich case the material between the corrugations must be stretched. Therolls l6 and I8 are provided with intermeshing teeth 44 of uniform depthand the axes of the rolls, as best shown in Fig. 2, are arranged at anangle to each other so that the corrugations formed thereby are deepestat the outer edge of the flange and decrease in depth toward the edgecrease C and terminate just short of the edge crease. In this manner thegreatest amount of foreshortening of the flange takes place along theouter edge and no foreshortening takes place along theedge crease sothat the action of the rolls in thus foreshortening ,the flange causesthe backpart blank to assume a curved shape. By confining thecorrugations to the heel-end portion of the blank or that portionbetween the lines a: and y in Fig. 6 the blank is caused to assumesomewhat the shape of a finished backpart.

In order to operate the rolls l6 and I8 the roll I6 is mounted on ashaft 48 (Fig. 2) journaled in an arm 58 pivoted at 52 about ahorizontal axis in the head I I of the housing ID. The shaft 48 carriesa pinion 54 which meshes with a pinion 56 carried by a shaft 58 on theouterend of which is mounted the corrugating roll IS. The shaft 58carries a sprocket 68 connected by a. sprocket chain 62 to a sprocket 64on the counter-shaft 36. Thus it will be seen that the shaft 58 carryingthe lower corrugating roll I8 is continuously driven during theoperation of the machine and through the pinions 56, 54 the shaft 48carrying the roll [6 is continuously driven therewith. The axis aboutwhich the arm 58 carrying the upper roll I8 pivots, coincides with thepitch circles of the pinions 54 and 56 so that the arm 50 may be movedabout its pivot to carry the roll l6 toward or away from the roll l8thereby to render the rolls ineffective while maintaining the pinions inconstant engagement. sufficient clearance is provided between the teethof the pinions to permit this movement of the, arm 58 and the shaft 48.

For moving the arm 50 carrying the upper corrugating roll l8 about itspivotal axis 52 the arm carries a rearward extension 68 which slidablyreceives the threaded upper end of a vertically extending rod 10, thelower end of which is pivoted at 12 to a lever 14, fulcrumed. Qll a SUQWI6 threaded into a wall of the housing III. A spring 18 surrounds therod 10 and acts between a collar 88 secured to the lower portion of therod and the under surface of the rearward extension 68 so that uponclockwise movement of the lever 14, as viewed in Fig. 2, the arm 50 ismoved in a clockwise direction through the compressive action of thespring 18, thereby to move the upper roll I 6 toward the lower roll l8into the position shown in Fig. 2. The upper end of the rod 10 carries apair of nuts 82 engageable with the upper surface of the extension 68when the lever 14 is moved in its counterclockwise direction thereby tomove the arm 50 to carry the roll l6 away from the roll I8. The lever 14is normally urged in a counterclockwise direction, to maintain thecorrugating rolls separated, by a spring 84 connected to the rearwardportion of the lever 14 and to a pin 86 secured to the side wall of thehousing Ill. The forward end of the lever I4 is connected by a treadlerod 88 to a suitable treadle, not shown, whereupon the rod may be pulleddown to move the lever 14 against the action of the spring 84 thereby tomove the upper corrugating roll l6 toward the lower roll l8.

In the normal operation of the machine the flange-forming roll l2 andthe corrugating rolls l5 and I8 are continuously driven from thecounter-shaft 36 and the upper corrugating roll is normally held in anelevated position, spaced sufliciently from the lower roll l8 so thatthese rolls will have no effect on the flange of a backpart blankpassing therebetween. One end of a blank is introduced between the rollsl2 and I4 whereupon the blank is fed therebetween and the flange F isformed along the length thereof, as shown in Fig. 5. With thecorrugating rolls l6 and I 8 sufliciently separated, the flange thusformed passes between these rolls without being acted upon thereby. Atthe proper time, however, during the passage of the blank between thecorrugating rolls the operator depresses the treadle, thereby moving theupper roll J6 toward the roll l8, whereupon corrugations areprogressively formed in a portion of the blank, such as from the line a:in Fig. 6 to the line 1/.

After the corrugations have been formed around to the liner the operatorremoves his foot from the treadle whereupon the corrugating rolls areseparated and the remaining portion of the flange is not corrugated.Inasmuch as thedepth of corrugations is greatest along the edge of theflange and decreases inwardly toward the edge crease C, the corrugationsterminating just short of the edge crease, the foreshortening effect onthe flange is greatest along the outer edge and decreases inwardly tothe edge crease, whereby the effect of the corrugating rolls is to formthe blank into a curved shape. By confining the corrugations to thatportion of the flange around the heel-end portion of the blank, asdefined by the lines :0, 1/, only that portion of the blank is curvedand the wing portions extending forwardly from these lines will besubstantially flat so that the blank is formed into a shapeapproximating that of a completed backpart, and the amount of finalmolding of the backpart neces-' sary to form the backpart into finishedshape is reduced to a minimum.

It will thus be seen that the machine in a single operation acts on aflat backpart blank to turn a flange and form corrugations in theflange, the corrugations being of such nature that the backpart iscurved into a shape approximating that of a completed backpart. By thuscorrugating the margin following the flanging operation, thecorrugations are readily confined to the flange and. objectionablewrinkles Visible in the finished shoe are avoided.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

1. In a machine for operating on flat backpart blanks, means forflanging the lower marginal portion of the blank, means forprogressively corrugating the flange, and operator-controlled means forrendering the corrugating means ineffective at will during the operationof the flanging means.

2. In a machine for operating on flat backpart blanks, means forflanging the lower marginal portion of a blank, and means for impartingto the flange thus formed corrugations the depths of which decreaseinwardly from the outer edge thereof.

3. In a machine for operating on flat backpart blanks, a pair ofcooperating rolls arranged to act on opposite sides of a blank to flangethe lower marginal portion thereof, and a pair of toothed rolls arrangedon axes inclined to each other to act on the flanged portion of theblank to form corrugations therein which decrease inwardly from the edgethereof.

4. In a machine for operating on flat backpart blanks, a pair ofcooperating rolls arranged to act on opposite sides of a blank to flangethe lower marginal portion thereof, a pair of toothed rolls arranged toact on the flanged portion of the blank to form corrugations therein,and operatorcontrolled means for separating said toothed rolls to renderthem ineffective.

5. Mechanism for corrugating the flange of a flat backpart blankcomprising a pair of intermeshing toothed rolls between which the flangeof the blank may be passed, shafts supporting said rolls, means fordriving one of said shafts,

intermeshing pinions carried by said shafts, and means for pivotallymounting one of said shafts to permit the roll carried thereby to beseparated from the other roll, the axis of the pivotal mounting passingthrough the pitch circles of the pinions.

6. Mechanism for corrugating the flange of a flat backpart blankcomprising a pair of intermeshing toothed rolls between which the flangeof the blank may be passed, means for mounting said rolls on aXesinclined with respect to each other, means for separating said rolls torender them ineffective, and means for continuously rotating said rollsat all times including periods of separation.

7. Mechanism for corrugating the flange of a flat backpart blankcomprising a pair of intermeshing toothed rolls between which the flangeof the blank may be passed, shafts supporting said rolls on axesinclined with respect to each other, means for moving one of said shaftstoward and away from the other, and means for continuously driving bothof said shafts at all times regardless of their relative positions.

8. Mechanism for corrugating the flange of a flat backpart blank whichcomprises a pair of rolls having intermeshing teeth of uniform depth,and means mounting said rolls for rotation about axes inclinedrelatively to each other whereby the corrugations impressed by the rollson a work piece are of variable depth.

9. Mechanism for corrugating the flange of a flat backpart blank whichcomprises a pair of rolls having intermeshing teeth of uniform depth,means mounting said rolls for rotation about axes inclined relatively toeach other whereby the corrugations impressed by the rolls on a workpiece are of variable depth, and means for moving one of said rollstoward and away from the other.

EMIERY R. DAVIS.

